Function for creating new tcpStream struct

newTCPStream.go

func newTCPStream(clock clockWrapper, netFlow gopacket.Flow, 
		  outChan chan<- akinet.ParsedNetworkTraffic,
		  fs akinet.TCPParserFactorySelector) *tcpStream {
	return &tcpStream{
		clock:           clock,
		bidiID:          akinet.TCPBidiID(uuid.New()),
		netFlow:         netFlow,
		factorySelector: fs,
		outChan:         outChan,
	}
}